Update to lowercase version for shadow quality

Author: 4ian

examples/3d-car-coin-hunt/3d-car-coin-hunt.json

@@ -4341,7 +4341,7 @@
               },
               "stringParameters": {
                 "color": "255;255;255",
-                "shadowQuality": "Medium",
+                "shadowQuality": "medium",
                 "top": "Z+"
               },
               "booleanParameters": {

examples/starting-3D-platformer/starting-3D-platformer.json

@@ -2290,7 +2290,7 @@
               },
               "stringParameters": {
                 "color": "255;255;255",
-                "shadowQuality": "Medium",
+                "shadowQuality": "medium",
                 "top": "Y-"
               },
               "booleanParameters": {

examples/starting-3d-driving/starting-3d-driving.json

@@ -1215,7 +1215,7 @@
               },
               "stringParameters": {
                 "color": "255;255;255",
-                "shadowQuality": "Medium",
+                "shadowQuality": "medium",
                 "top": "Y-"
               },
               "booleanParameters": {

examples/starting-first-person/starting-first-person.json

@@ -1576,7 +1576,7 @@
               },
               "stringParameters": {
                 "color": "255;255;255",
-                "shadowQuality": "Medium",
+                "shadowQuality": "medium",
                 "top": "Y-"
               },
               "booleanParameters": {